Explanation:
Have a good luck with ur exam
Answer:
H20
-log(3.5 * 10^-11)
= 10.4559
Be careful how you put this into your calculator. I had to use Exp to get it to work properly.
-log
(3.5 * 10 exp -11)
=
21 years
% of parent isotope remaining before safe
6.25%
A.it is Postindustrial
